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The regular PF tek says to birth the cake when u can already see the pinheads in your jar but the "Simple Cubensis Growing Technique" says to birth the cake when it is fully colonized but with no pinheads. Any suggestions as to which one is right would be greatly appreciated.

i did my first set of jars and tried both ways, the 3 cakes i birthed when colonized already had a full flush before there were even pin in my jars, so after leaving in jar for 2 weeks after birthing other cakes i went ahead and birthed and cased, and had pins by the end of the week

But IME, I have witnessed pins forming inside a jar very quickly when exposed to light (when the jars have poly-fill lids). This has happened to me accidentally on more than one occasion and I was amazed at how quickly pins formed in terms of time exposed, and elapsed. Compared to when I grew cakes, they were much, much faster than when I birthed them and put them in the fruiting chamber. If I was to grow cakes again I would wait until fully colonized and put them in some light, wait for the first sign of pins, then birth. Although, I would not expect to have the same air exchange as with poly-fill if you are using the hole and dry verm layer technique. I never had this happen before I used poly-fill.

Invitro pinning with proper air exchange has potential. Try both and see which works better for you.